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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68760f4e464986fe8372b7e1dead8d6d2997ddbd02e2dec366b7df12771cdacc' 
  AND token = 'N94jdonvLqp8iGMxib7B7StE1h3V71/WumWRbwoBZag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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