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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91815ddf6fcf788edf2a2708bf8b55a51d7a0bf8736146b682b6eab5e58c1009' 
  AND token = 'TSda5lIdBB2bIMYyTbbU35nf0zcSJBN+TOGBZ+Qzx9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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