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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08cf0898fa70abf372c6959a820f2d60defcbb9654de383fe3dad8f7a684e010' 
  AND token = 'srqsPx/ZmePABu3pm4K8RbtNK1fQtuWebU62V98GNnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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