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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd420e4b62fd4dba0be8c38a42ea78e6649f786b1a9d1c9bc5917d1b49e1e968f' 
  AND token = 'Ha+MXbY6Ac8e277tIlyKJS6JdJflqn8BKFGBi9tEPno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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