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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1fe5531ac9f3d28eefaba8b19c4fdcd4ab50d8aa6c451b6e99121870ab20bc' 
  AND token = 'lb5aZkALtpbumRyZXltU1wpsT7/yMKqxiQEqH1826aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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