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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcbda0fa177a9668151dda2d3654e44c39dfd53810f6c6179bf703d31a148ef4' 
  AND token = 'qPo81orVFTY58II/nPs66KAKoVoIyGiSf0Ya+KjPFAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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