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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42da8d1bdde0d45602fa62401824d0633a71a91b347537ea68d478af21669db7' 
  AND token = 'oTUXDY72yUWNpl1BDDGJ6Gvo+K0CyYbnlNS+RuKv4ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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