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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc24df0eb57614c26c8d2ba8ddd26ab7118e7292a89c4ffe08f42f824445306' 
  AND token = 'fwFWcLYB7ETkCZEVH1946qljjQ0/RDskbDz9xeLSQDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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