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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b771b3e54928763f25008da638ebbfebe6f34ab761da7d316d0ed4a7482c9a3e' 
  AND token = '8wCSPrWJhdDa3xknSzwJG61aV4IPHadmfnmocPVFrYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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