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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '407c55b861f40d49b883af4e9c31b1f0f17825f4ac7095ff3f7eb4c6cc095f6a' 
  AND token = '+gYj8Cax5Ukhy3xT+Yk1wCEEtKmErVvb8H6dl58+lbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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