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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c0f1f70a4a3f0f261c52a87136828c3da3b3e991d1ad27d18d4d9110b46fec' 
  AND token = 'g5e3YI5sCycNESk9oTOuHqkksLW5YWZK9fxEnU5ZXoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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