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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da3caba5f40da28749068d4ab4b91d722113fb834ba7b19e9ebbe3147db252c' 
  AND token = 'LD9VeGKFLuRXGkyNcxQvj8JuZ5ZHgyZdPlMcWjZany0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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