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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d379dcc8543cad4df306b7f5d2d4a2cfc1c8b4a6b4fb0e2c3f0ddebb139234' 
  AND token = 'G11iEpJ8Crfb83p5oIGMh/MT2aKHELbusMDQSM4qga0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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