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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d117d315f2cc85fea4c698c1cf36566d4e311c2a7a384c7526a000a137e876b' 
  AND token = 'eBlXg627nLRiJ5LSYHy/q6MmYHI5zV5W8dseGy5BqF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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