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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d5f9902b4baea513dcd261546f13065c6340faf77c1a1c3dcb748c49f45da6' 
  AND token = 'y0ofkmWBTiHcl3BxPsn5+klpt0U1bhFg8IpPA8+3BnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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