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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfaaab9555ae2ccff553766c4b8c5641c648ff29dae33fcca9c06a102fb8b153' 
  AND token = 'cmu/1wyXdFozgEsNoSu7R9/OSxQe8ymIohImxtqicpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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