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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77163b25c5c0c2f1d7959d6c2119efcb1fc7038777b5e50e24ed0d5e8c76e8f1' 
  AND token = 'C7St7oxT2lm5a4G1DtaFpmYSuGs4Ylwvl3zlkMsLcGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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