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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5bac21ea6f1dae1fcaa62c4a0d7f2eb56c6d722f0258671cbc201bfdcb9d465' 
  AND token = 'CRlGQ5fq1M3/C6e13kZy4LMgr+7jCl4GbJRhPKmciWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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