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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9b69cc96397bb97e96f422ed4e74d75beb2dc7b8a8ffe9eb36149113da45d2' 
  AND token = 'frgCJ/p8xPxFPinXUG1iNUFmIj2QTZUR7+uE5PfVaoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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