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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dde7a13a4fb1958eb2f6e86007146e405a4be23ce48e5e1510b2fa1d708d7eb' 
  AND token = 'nzDQ1/n3UEYJkf9Z7YAyQK1vLXp4L58lpd77XYQ6o9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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