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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f1500a81af6e91bc017ea83f6a0dcc9e9fedfa701fe1a0e4262e07397bdb30' 
  AND token = 'eEkQftrtOhyUYUt9qvzGbgABPmHiJFTuSZFtmNBzozY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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