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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99884c0cf402d6ef2d128a93bac6906e99f6c0b2843c0bc7ca7955264d2add5d' 
  AND token = 'IgU3r4oTExkPe3uFWxomu0f2NC94vf5hX4jy3/cbpKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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