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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635fbfb1808750db1d77d1172f108e5fee8632ad90312d0e6980e5ac6915c6f5' 
  AND token = 's58g8RpC4w1Da8VBj31ZdfoPWcu43mBEhKbxa+uNWXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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