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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38dda17b6ad0471d17ef7b93538968b813be155ec2f468bee911cc717598ba48' 
  AND token = 'lbfvM5IKb0n8mw8bxAnaz201lF///UwT5Lw+W3OoQYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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