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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0627edd85b83f52266cd44bc36f6d9cc99a6d8ba6f8e410e00e6db0733c66c50' 
  AND token = 'aEjQYF/n4ahhGqYLSxv2FlwnbNHi43vvcpGYXpXICoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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