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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29c4444355c1d657e321708d39c8ed1d5bdabf4497d8f321beabddaf94e32f9' 
  AND token = 'Suedeo1PKzeHILOgkCAeE8l0o8VHv72S5Ea/ClXkN0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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