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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1f1bb6da04f41ef8183a8213104761be39ad6fc0446f6817421d36c6893348' 
  AND token = 'IBMzVJTdhIE9bKvbe8yMZ4Q2Yr+agP9hAIxAcQatY48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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