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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed2d26ef8f8ce36acb51e3eed851a8086d758a4341fb9d90dca8fa438ec58f0' 
  AND token = '9k0DFOntsyyPlmyN6Yb6e4u5KiWwdofzTK2iaSX7S/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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