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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3adbc796e54a084f0189915efbb5333346fea390d7d0385d044e00929607bfa5' 
  AND token = 'zG4IKC/M8zzvgULS+yNdaX/HdJ7bJ88fofGLx5FK/sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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