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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd08a31a48804872b8fefb72994a5aaaf8672f9afd4d6d9659bda76c61bfe3f2' 
  AND token = 'HeyXj4uA2Jk8D+h8ZP1OVO2NTfyF9qb/FizFGAUoN04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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