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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93635501e0dde0bbd609be7bca3c5194a59083f150054c056698d8fee56f0268' 
  AND token = 'Bn3e+2kYjVK9rlN6zHV5KeciY2JO9E6/IdnQs4Wl3QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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