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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09e0b0ea4eb887355d1f8906d63078920c655b4a5313b3912b645b5b56e42e3' 
  AND token = 'JWeud8jzl76I2TNBsSInRiPvO6fjFDKTLHQw1Fp2nlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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