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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6171855e1a48a07dcc4eac30ab27dddc6c0bd090f32d30c4059fb7e076b1bfd' 
  AND token = 'Y8K58/FDypCWNwAMRD4Kl+txwC5EHP6q+aTz+M/mSdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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