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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea68cf42c3cdf41570a499d54030873ad12aede3beb34d0a420668b28558cdc' 
  AND token = 'mcr9hX8bm+o7GLLYdYxlpTiv5AWFkTHcv7Eb5FF/rI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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