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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e64068102530d57a981a24928c4f7d1bc6d8a50ae385c984c7552e00f6c3e7e5' 
  AND token = 'cKbEPzHI28VurOsMNLR06Z3b7epde6ZP0+92Yv7mQHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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