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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5987d81f2b370c0419d46b8c58c04f13ef46486d25eb16cec70d285f42e62b4b' 
  AND token = 'RuCdu5809F/qNhR4XO0v+rt9GAVF1QegyFOJn7asiZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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