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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd636e733b936127c3e1ff77535c4e5769cb5f3d893236de5d442190260f8852' 
  AND token = 'LAecRVa9L1ltnugKHJ+0a21mC02Bwcp/pKXkuNUgI5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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