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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2f2c15e0b6bbe4181d6880bdfddcacac2ab9d9a38b33c22b9b629a81a3902e' 
  AND token = 'J0q6BTUljLYjVa1VpJ0LrqDiLWydgtZYasQXqgcU+tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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