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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe0c5370f0f8e0bedf3c78f1bdbf9f8eb1e1a5646ba4b3afb4f31b4d046dea0' 
  AND token = 'qDRTfShylAh6k9ih6n/65LOFxB41XQgwESErK4U44W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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