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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4559bee50cdabca3d045d585c09764ec46f002f74003720c9fe23ce19b8e3939' 
  AND token = 'G82nc5OKAOFV/u4gmy1frnss/ywuxiZGE80qK88XU2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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