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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b51d69fa9b8e13520cd643a833e889a75b0694b5a985382ef1bc41c6a91cb4b7' 
  AND token = 'Fi8O2D4V3lxPe9VSWGPkldQrqr4g40ny/6ovvaCRpZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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