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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08d5ccf9450a6405b33eff8043fd8291927c1ba36ff8db478338f52b7cbdcd1' 
  AND token = 'L8LP2Elp63gv/9iJbbM2Ig5l8ZkZaq9wXQ7tWN/zjA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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