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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e9ebfb40784df2180b501c3e95786a37d421ffa89cc526c82dc708aa8903b4' 
  AND token = 'Dba8KZHIWSlqL7vxktbXLjo3P0sqCVjw7vHrj0k21ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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