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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a35c6674669f0d62cac1857078c3d506d8474bcb7ae8b05f1de55eeeba3834f' 
  AND token = 'gPzn5e8QsyGlDLyFXZcinSgsUeaMAKHe2UgI5VBXzl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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