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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08899cbee8ba4b69253df505ada8e65a02a90d8e9fb6d4c6a3d32e0ec55747f9' 
  AND token = 'd7CVYqGQsEJtXLCaX+UfNl9uAyOQeMz2woGJn+n69oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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