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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f700695da1d297bddebcfc61c0091996e74f881a0258ae523d2bf7ee18f8f00' 
  AND token = 'RoMqOJrt7lcODoHANxWoa9K+FyJDQm5qvxSdiyf+s3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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