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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a25005314273a0ff5874062c3e20fc1eee2712eafd18a747bd634044be2dbb' 
  AND token = 'zs2TDpMpqciAY0ofIGCMFvjFKRZlTWB4pPTplxQVheA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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