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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd59d79be47d89e4edf79d1f54fd97f6e11e339e6863b7fa7b63d596a7b1644' 
  AND token = 'e1bxBxaZw5Gst4lRNV/dkvP1cbw+pTlH8+aU392nFqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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