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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4559c9d9ee19865284fd1b8ee48bd1d2ba799c6798861adee293139f27f117' 
  AND token = 'UJauMCVF4IKEkjug0GS7J61pTILXQAeMIld7htJ5g1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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