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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9675213c41364c4f5053b773dde8d15682bde8820716e9afb7bfc6b96a17a06d' 
  AND token = 'xCVVtelUd0sDMUHCmNVuO8l/529cS9tUuMB5tR5oRQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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