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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f11ed61a1abb983a131e4f47400ef5aa8804cbd772e91ae94b4b26bf47c85d1' 
  AND token = '1mbxhjB5EM9KRYbLnb5L5LVhs2dV/Hqt1UGLkaeZLaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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