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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fabd20bfa514975ad0cc0776bc3d188db5667f69c4c607584b17d024508ecc' 
  AND token = 'ozhOLuxYBJi0OHLz2uiCxFHmHT3DN1gWm60d9D/Jn5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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