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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab150783970e9d17d19c18fc02d66297741aed8e27d12d756db80b7e2e793285' 
  AND token = '6WALMJWsmb/RCUO3PjLA1H6hEZfpfL0mC/COuUq+hus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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