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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6b33c1c0df021e80a89044292c56c186c2228382a1e1653cb3bb3fcefc834b' 
  AND token = '1Mce4VMshnx903wJGYMUobhSJ6l+cIZ2ChrIoaStT5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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