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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee399f421016701488b2ba3f5d0db106ec345725b19d25d808dde27b6695bd7' 
  AND token = '3feZ63rA8yDGF5o53n8JOILiZJ5K2sqyXCWn34DAY1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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