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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d206b78bb97cfae1a6ac5dfd231e44f60913847f17498daa9b67f4041ecec5' 
  AND token = 'kwCGPPpq73ukSiseT9anDkxRgOgPERvQSjwfB3lNK4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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