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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffff02e1db89716eb7f7a9c29f66aa1327500827d438ea2b68a691cea0b430a4' 
  AND token = '5XPMdtz2/eh+wcXh7Zg++mMJvYvKklecQ7d26QGE0ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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