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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7bcb0fe7353e6f41d7c65722f735e6e617f2309b1693aab5fd02ac3cbec0f1' 
  AND token = 'vpxOKstG58ck/VwmjOnyIZFrk/II6PdBYmRu96PmBPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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