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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ca67dbc1902e82bdafb89b44d96c0a362f2a2ebb72dd9988b00089164bf950' 
  AND token = '4WSUwh8DbZRfNggwbKtpB2OKWZyevUZo8mHyGSLXCCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}