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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cc7df605aec5e0f2f9332fb73b8ed8b042378a6be9b845667d6d00fb54f3b1' 
  AND token = '7o92MWKoHFyCa51WQEtgM3oUBQ98y8VCQdZLviIoDm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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