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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65555b2e8450eefbad8851f3de79d03a682d806cdb94a22b172d0f4f0d71e05c' 
  AND token = 'nLPilKVqbx3al2+NKFWXrXoz1ludobPJTx3bntQbgy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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