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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fa2bd7e2a4bd314e1739c99ea25c1a894f9cac66e791730d9b5e1cbc8f6097' 
  AND token = 'cZCZG2uUys3MDWb0xcsDhYBGDpGsSeFCFmCaOBA9wzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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