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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee026610ec27fa121bfc95ed3bfe19382dc13b4c8785bbeb2cd235b9a12fe7ff' 
  AND token = 'tuT9ttwQDR/E7DTT0KPk03rXG1tpoh0p20KvHyT+Dog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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